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research report | February 2026

research report | February 2010

Stephen G. Ritchie, Shin-Ting Jeng, Andre Tok, Dmitri Arkhipov, Pedro Veiga De Camargo, Rex Chen, Joseph Y.J. Chow, Jae Young Jung, Fatemeh Ranaiefar and Miyuan Zhao (2010) Assessment and Development of Commodity Flow, Logistics, and Other Relevant Goods Movement Data Sources to Facilitate Statewide Freight Modeling. Research Report. ITS-Irvine.

published journal article | February 2026

published journal article | April 2019

Yiqiao Li, Andre Y.C. Tok and Stephen G. Ritchie (2019) “Individual truck speed estimation from advanced single inductive loops”, Transportation Research Record, 2673(5), pp. 272–284.

published journal article | January 2026

published journal article | December 2021

Yiqiao Li, Koti Reddy Allu, Zhe Sun, Andre Y. C. Tok, Guoliang Feng and Stephen G. Ritchie (2021) “Truck body type classification using a deep representation learning ensemble on 3D point sets”, Transportation Research Part C: Emerging Technologies, 133, p. 103461.

Phd Dissertation | January 2026

Phd Dissertation | January 2008

Yeow Chern Andre Tok (2008) Commercial vehicle classification system using advanced inductive loop technology. Ph.D.. University of California, Irvine.

working paper | January 2026

working paper | August 2014

Paulos Ashebir Lakew and Yeow Chern Andre Tok (2014) Determinants of Air Cargo Traffic in California. Working Paper UCI-ITS-WP-13-7. Institute of Transportation Studies, Irvine.

published journal article | January 2026

published journal article | May 2021

Jaeyoung Jung, Andre Tok and Stephen G. Ritchie (2021) “Determining optimal sensor locations under uncertainty for a truck activity monitoring system on California freeways”, Journal of Intelligent Transportation Systems, 25(3), pp. 221–234.

published journal article | January 2026

published journal article | June 2023

Yiqiao Li, Andre Y. C. Tok, Zhe Sun, Stephen G. Ritchie and Koti Reddy Allu (2023) “LiDAR Vehicle Point Cloud Reconstruction Framework for Axle-Based Classification”, IEEE Sensors Journal, 23(11), pp. 11168–11180.

research report | January 2026

research report | December 2023

Craig Rindt, Mingqi Yao, Naila Sharmeen, Andre Tok, Stephen G. Ritchie, Blake Lane, Kate Forrest, Mike MacKinnon, Scott Samuelsen, Bo Liu, Kanok Boriboonsomsin, Abdullah Fuad Un-Noor, Suman Mitra, Farzana Mehzabin Tuli and Vuban Chowdhury (2023) Low-Carbon Transportation Incentive Strategies Using Performance Evaluation Tools for Heavy-Duty Trucks and Off-Road Equipment. Draft Final Report. California Air Resources Board / Institute of Transportation Studies, UC Irvine.

research report | December 2025

research report | September 2010

Stephen G. Ritchie, Andre Tok, Shin-Ting Jeng, Hang Liu, Sarah V. Hernandez and Jin Heoun Choi (2010) Online Freeway Corridor Deployment of Anonymous Vehicle Tracking for Real Time Traffic Performance. Research Report CA11-1226, UCI-0279. ITS-Irvine.

conference paper | December 2025

conference paper | January 2007

Shin-Ting Jeng, Stephen G. Ritchie and Yeow Chern Tok (2007) “Freeway corridor performance measurement based on vehicle reidentification”, in Proceedings of the 86th annual meeting of the transportation research board, p. 23p.

policy brief | December 2025

policy brief | October 2019

Andre Tok, Stephen Ritchie and Craig Rindt (2019) New Tool from UC Irvine Could Save the State Millions while Providing Better Data on Truck Activity in California. Policy Brief. UC ITS.

research report | December 2025

research report | January 2018

Jaeyoung Jung, Andre Tok and Stephen G Ritchie (2018) Determining optimal sensor locations under uncertainty for advanced truck surveillance on California freeways.

published journal article | December 2025

published journal article | January 2025

Yiqiao Li, Andre Y. C. Tok and Stephen G. Ritchie (2025) “Adaptive Self-Learning Framework for Resilient Vehicle Classification Through the Integration of Inductive Loops and LiDAR Sensors”, IEEE Open Journal of Intelligent Transportation Systems, 6, pp. 768–780.

research report | December 2025

research report | September 2013

Jaeyoung Jung, Andre Tok, Stephen G. Ritchie and Irvine University of California (2013) Optimal sensor locations for advanced truck surveillance on California freeways, p. 21p.

conference paper | December 2025

conference paper | January 2021

Yiqiao Li, Koti R Allu, Zhe Sun, Andre Tok, Guoliang Feng and Stephen G. Ritchie (2021) “An Ensemble Approach to Truck Body Type Classification using Deep Representation Learning on 3D Point Sets”. 100th Transportation Research Board (TRB) Annual Meeting, Washington, DC.

conference paper | December 2025

conference paper | January 2017

Kyung (Kate) Hyun, Kyungsoo Jeong, Andre Tok and Stephen G. Ritchie (2017) “Assessing crash risks considering vehicle interactions with trucks using point detector data”, in Proceedings of the 96th annual meeting of the transportation research board, p. 17p.

published journal article | December 2025

published journal article | July 2025

Guoliang Feng, Yiqiao Li, Andre Y.C. Tok and Stephen G. Ritchie (2025) “Infrastructure-based sensor fusion for acquiring gross vehicle weight rating classifications”, Transportation Research Interdisciplinary Perspectives, 32, p. 101535.

book/book chapter | December 2025

book/book chapter | January 2023

Yiqiao Li, Andre Tok, Guoliang Feng and Stephen G. Ritchie (2023) “Understanding and Modeling the Impacts of COVID-19 on Freight Trucking Activity”, in A. Loukaitou-Sideris, A.M. Bayen, G. Circellaand R. Jayakrishnan (eds.) Pandemic in the Metropolis: Transportation Impacts and Recovery. Cham: Springer International Publishing (Springer Tracts on Transportation and Traffic), pp. 113–128.

conference paper | December 2025

conference paper | January 2022

Yiqiao Li, Andre Tok and Stephen Ritchie (2022) “A Self-Learning Framework for Vehicle Classification System through the Integration of Advanced Inductive Loops and Multi-array LiDAR Sensors”. 101st Annual Meeting of the Transportation Research Board.

published journal article | December 2025

published journal article | January 2016

Kyungsoo Jeong, Andre Tok, Stephen G. Ritchie and Junhyeong Park (2016) “California vehicle inventory and use survey: Pilot study insights”, Transportation Research Record, 2547(1), pp. 32–40.

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